Spine board



FIG. 1 is a front view of a spine board embodying our new design;

FIG. 2 is a left side and mirror image view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a bottom elevational view thereof; and,

FIG. 5 is a top elevational view thereof. 

The ornamental design for a spine board, as shown and described. 